Backlight unit and display device including backlight unit

ABSTRACT

A backlight unit including a frame including a bottom and a sidewall extending from the bottom; at least one substrate located on the frame, and a plurality of light sources mounted on the at least one substrate; and a reflecting sheet located on the at least one substrate, further the reflecting sheet includes a first sheet part located on the bottom, the first sheet part including a plurality of holes corresponding to the plurality of the light sources; and a second sheet part extended from the first sheet part, the second sheet part including a horizontal dot area located along a long side of the reflecting sheet and a vertical dot area located along a short side of the reflecting sheet, and at least one of the horizontal dot area and the vertical dot area comprising first areas and second areas, also the first areas correspond to outermost holes among the plurality of holes, and the second areas are located between the first areas, in addition the first areas and the second areas include a plurality of dot areas, further each of the dot areas includes a plurality of dots, also a size of dots included in one of the plurality of dot areas is different from a size of dots included in another of the plurality of dot areas in the first area, in addition a size of dots included in one of the plurality of dot areas is different from a size of dots included in another of the plurality of dot areas in the second area, further the first and second areas comprise first dot areas, the first dot areas are positioned at a same distance between a first distance and a second distance from a line, the line being an imaginary line connecting the outermost holes along at least one of the long side and the short side of the reflecting sheet, and also a size of dots included in the first dot area of the first area is greater than a size of dots included in the first dot area of the second area.

This application is a Continuation of copending U.S. application Ser.No. 14/928,621, filed on Oct. 30, 2015, which claims priority under 35U.S.C. § 119(e) to U.S. Provisional Application No. 62/073,509 filed onOct. 31, 2014, and under 35 U.S.C. § 119(a) to the priority benefit ofKorean Patent Application No. 10-2015-0109157 and Korean PatentApplication No. 10-2015-0109161 both filed in the Korean IntellectualProperty Office on Jul. 31, 2015, the entire contents of which areincorporated herein by reference for all purposes as if fully set forthherein.

BACKGROUND OF THE INVENTION

Field of the Invention

The present disclosure relates to a backlight unit and a display deviceincluding the backlight unit.

Discussion of the Related Art

With the development of the information society, various demands fordisplay devices have been increasing. Various display devices, such asliquid crystal displays (LCDs), plasma display panels (PDPs),electroluminescent displays (ELDs), and vacuum fluorescent displays(VFDs), have been recently studied and used to meet various demands forthe display devices.

Among the display devices, a liquid crystal display panel of the liquidcrystal display includes a liquid crystal layer, and a thin filmtransistor (TFT) substrate and a color filter substrate which arepositioned opposite each other with the liquid crystal layer interposedtherebetween. The liquid crystal display panel displays an image usinglight provided by a backlight unit of the liquid crystal display.

SUMMARY OF THE INVENTION

The present disclosure provides a backlight unit including a reflectingsheet having a dot area.

In one aspect, there is a backlight unit including a frame including abottom and a sidewall extending from the bottom; at least one substratelocated on the frame, and a plurality of light sources mounted on the atleast one substrate; and a reflecting sheet located on the at least onesubstrate, wherein the reflecting sheet includes: a first sheet partlocated on the bottom, the first sheet part including a plurality ofholes corresponding to the plurality of the light sources, and aplurality of first dots; and a second sheet part extended from the firstsheet, the second sheet part including a plurality of second dots,wherein the plurality of first dots are positioned adjacent to at leastone of the plurality of holes.

The first sheet part may include an outer area including at least oneoutermost hole of the plurality of holes and an inner area including atleast one inner hole of the plurality of holes, the inner area beingsurrounded by the outer area.

The plurality of first dots may be positioned around the at least oneoutermost hole in the outer area.

The plurality of first dots may be further positioned around the atleast one inner hole in the inner area.

The plurality of first dots may be positioned in a partial surroundingarea of the at least one outermost hole in the outer area.

Sizes of a plurality of dots of the plurality of first dots may be thesame as each other.

A plurality of dots of the plurality of first dots may include at leasttwo dots having different sizes.

The plurality of second dots may include a horizontal dot area formedalong a first side of the reflecting sheet and a vertical dot areaformed along a second side of the reflecting sheet, and wherein asurface area of a first hole of the plurality of holes may be differentfrom a surface area of a second hole of the plurality of holes, thefirst hole may be at least one hole adjacent to the horizontal dot area,and the second hole may be at least one hole adjacent to the verticaldot area.

The plurality of first dots may be positioned around remaining outermostholes excluding at least one outermost hole adjacent to a corner of thereflecting sheet from outermost holes included in the outer area.

The plurality of first dots may be positioned around the at least oneinner hole in the inner area.

In the inner area, a first hole of the plurality of holes may have theplurality of first dots and a second hole of the plurality of holes maynot have the plurality of first dots positioned adjacent to each other.

In the outer area, first holes of the plurality of holes adjacent to afirst side of the reflecting sheet may be symmetric with second holes ofthe plurality of holes adjacent to a third side of the reflecting sheet.

The backlight unit may further include a hole sheet inserted into atleast one of the plurality of holes, wherein the plurality of first dotsmay further include dots on the hole sheet.

Sizes and densities of dots of the plurality of first dots may be thesame as each other.

At least one of sizes and densities of dots in the plurality of firstdots may be different from each other.

At least one of the plurality of holes may have a straight portion and acurved portion.

The backlight unit may further include a plurality of support plateholes, into which support plates are inserted respectively.

The first sheet part may include a third dot area includes a pluralityof third dots, and may be positioned adjacent to at least one of theplurality of support plate holes.

The third dot area may have an asymmetric shape.

The at least one substrate may be in plural, and wherein the reflectingsheet may further include at least one cut part corresponding to atleast one connection portion between the plurality of the substrates.

The backlight unit may further include a third sheet part extended fromthe second sheet and located on the sidewall.

In other aspect, there is a display device including a frame including abottom and a sidewall extending from the bottom; at least one substratelocated on the frame, and a plurality of light sources mounted on the atleast one substrate; a reflecting sheet located on the at least onesubstrate, an optical sheet located on the reflecting sheet; and adisplay panel located on the optical sheet, wherein the reflecting sheetmay include: a first sheet part located on the bottom, the first sheetpart including a plurality of holes corresponding to the plurality ofthe light sources, and a plurality of first dots; and a second sheetpart extended from the first sheet, the second sheet part including aplurality of second dots; wherein the plurality of first dots arepositioned adjacent to at least one of the plurality of holes.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention andtogether with the description serve to explain the principles of theinvention. In the drawings:

FIGS. 1 and 2 illustrate a display device according to an exampleembodiment of the invention;

FIGS. 3 to 7 illustrate configuration of a display device related to anexample embodiment of the invention;

FIGS. 8 and 9 illustrate a light source according to an exampleembodiment of the invention;

FIG. 10 illustrates a connection relationship between a reflecting sheetand components around the reflecting sheet according to an exampleembodiment of the invention;

FIGS. 11 to 13 illustrate configuration of a reflecting sheet accordingto an example embodiment of the invention;

FIGS. 14 to 17 illustrate a dot distribution of a reflecting sheetaccording to an example embodiment of the invention;

FIGS. 18 to 25 illustrate configuration related to a lens hole of areflecting sheet according to an example embodiment of the invention;

FIGS. 26 to 30 illustrate configuration related to a lens holereflecting sheet according to an example embodiment of the invention;

FIGS. 31 and 32 illustrate a reflecting sheet according to an exampleembodiment of the invention;

FIG. 33 illustrate configuration related to a lens hole of a reflectingsheet according to an example embodiment of the invention;

FIGS. 34 and 35 illustrate configuration related to a supporter hole ofa reflecting sheet according to an example embodiment of the invention;and

FIGS. 36 to 39 illustrate configuration related to a cutting portion ofa reflecting sheet according to an example embodiment of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to embodiments of the invention,examples of which are illustrated in the accompanying drawings. Whereverpossible, the same reference numbers will be used throughout thedrawings to refer to the same or like parts. A suffix such as “module”and “unit” may be assigned or used interchangeably to refer to elementsor components. Use of such a suffix herein is merely intended tofacilitate the description of the embodiments of the invention, and thesuffix itself is not intended to give any special meaning or function.It will be paid attention that detailed description of known arts willbe omitted if it is determined that the detailed description of theknown arts can obscure the embodiments of the invention. Theaccompanying drawings are merely intended to easily describe theembodiments of the invention, and the spirit and technical scope of thepresent invention is not limited by the accompanying drawings. It shouldbe understood that the present invention is not limited to specificdisclosed embodiments, but includes all modifications, equivalents andsubstitutes included within the spirit and technical scope of thepresent invention.

Hereinafter, the embodiments of the invention are described using aliquid crystal display panel as an example of a display panel. Otherdisplay panels may be used. For example, a plasma display panel (PDP), afield emission display (FED) panel, and an organic light emitting diode(OLED) display panel may be used.

In what follows, a display panel may include a first long side LS1, asecond long side LS2 opposite the first long side LS1, a first shortside SS1 adjacent to the first long side LS1 and the second long sideLS2, and a second short side SS2 opposite the first short side SS1.

In the embodiment disclosed herein, the first short side SS1 may bereferred to as a first side area; the second short side SS2 may bereferred to as a second side area opposite the first side area; thefirst long side LS1 may be referred to as a third side area which isadjacent to the first side area and the second side area and ispositioned between the first side area and the second side area; and thesecond long side LS2 may be referred to as a fourth side area which isadjacent to the first side area and the second side area, is positionedbetween the first side area and the second side area, and is opposite tothe third side area.

The embodiment of the invention describes that lengths of the first andsecond long sides LS1 and LS2 are longer than lengths of the first andsecond short sides SS1 and SS2 for the sake of brevity and ease ofreading. However, the lengths of the first and second long sides LS1 andLS2 may be almost equal to the lengths of the first and second shortsides SS1 and SS2.

In the following description, a first direction DR1 may be a directionparallel to the long sides LS1 and LS2 of the display panel, and asecond direction DR2 may be a direction parallel to the short sides SS1and SS2 of the display panel.

Further, a third direction DR3 may be a direction vertical to the firstdirection DR1 and/or the second direction DR2.

In the embodiment disclosed herein, the first direction DR1 and thesecond direction DR2 may be commonly referred to as a horizontaldirection.

Further, the third direction DR3 may be referred to as a verticaldirection.

FIGS. 1 and 2 illustrate a display device according to an exampleembodiment of the invention.

As shown in FIGS. 1 and 2, a display device 100 according to theembodiment of the invention may include a display panel 110 and a backcover 150 positioned in the rear of the display panel 110.

The back cover 150 may be connected to the display panel 110 in asliding manner in a direction (i.e., the second direction DR2) from thefirst long side LS1 to the second long side LS2. In other words, theback cover 150 may be inserted into the first short side SS1, the secondshort side SS2 opposite the first short side SS1, and the first longside LS1 which is adjacent to the first and second short sides SS1 andSS2 and is positioned between the first short side SS1 and the secondshort side SS2, of the display panel 110 in the sliding manner.

The back cover 150 and/or other components adjacent to the back cover150 may include a protrusion, a sliding unit, a connection unit, etc.,so that the back cover 150 is connected to the display panel 110 in thesliding manner.

FIGS. 3 to 7 illustrate configuration of a display device related to theembodiment of the invention.

As shown in FIG. 3, the display device 100 according to the embodimentof the invention may include a front cover 105, the display panel 110, abacklight unit 120, a frame 130, and the back cover 150.

The front cover 105 may cover at least a portion of a front surface anda side surface of the display panel 110. The front cover 105 may have arectangular fame shape, in which a center portion is empty. Because thecenter portion of the front cover 105 is empty, an image displayed onthe display panel 110 may be seen to the outside.

The front cover 105 may include a front cover and a side cover. Namely,the front cover 105 may include the front cover positioned at the frontsurface of the display panel 110 and the side cover at the side surfaceof the display panel 110. The front cover and the side cover may beseparately configured. One of the front cover and the side cover may beomitted. For example, the front cover may be omitted, and only the sidecover may be absent in terms of a beautiful appearance of the displaydevice 100.

The display panel 110 may be positioned in front of the display device100 and may display an image. The display panel 110 may divide the imageinto a plurality of pixels and may output the image while controllingcolor, brightness, and chroma of each pixel. The display panel 110 mayinclude an active area, on which the image is displayed, and an inactivearea, on which the image is not displayed. The display panel 110 mayinclude a front substrate and a back substrate which are positionedopposite each other with a liquid crystal layer interposed therebetween.

The front substrate may include a plurality of pixels each includingred, green, and blue subpixels. The front substrate may generate animage corresponding to the red, green, or blue color in response to acontrol signal.

The back substrate may include switching elements. The back substratemay turn on pixel electrodes. For example, the pixel electrode maychange a molecule arrangement of the liquid crystal layer in response toa control signal received from the outside. The liquid crystal layer mayinclude a plurality of liquid crystal molecules. The arrangement of theliquid crystal molecules may change depending on a voltage differencebetween the pixel electrode and a common electrode. The liquid crystallayer may transmit light provided by the backlight unit 120 to the frontsubstrate.

The backlight unit 120 may be positioned at a back surface of thedisplay panel 110. The backlight unit 120 may include a plurality oflight sources. The light sources of the backlight unit 120 may bearranged in an edge type or a direct type. In an instance of the edgetype backlight unit 120, a light guide plate may be added.

The backlight unit 120 may be coupled to a front surface of the frame130. For example, the plurality of light sources may be disposed at thefront surface of the frame 130. In this instance, the backlight unit 120may be commonly called the direct type backlight unit 120.

The backlight unit 120 may be driven in an entire driving method or apartial driving method such as a local dimming method and an impulsivedriving method. The backlight unit 120 may include an optical sheet 125and an optical layer 123.

The optical sheet 125 can cause light of the light sources to beuniformly transferred to the display panel 110. The optical sheet 125may include a plurality of layers. For example, the optical sheet 125may include at least one prism sheet and/or at least one diffusionsheet.

The optical sheet 125 may further include at least one coupling unit 125d. The coupling unit 125 d may be coupled to the front cover 105 and/orthe back cover 150. Namely, the coupling unit 125 d may be directlycoupled to the front cover 105 and/or the back cover 150. Alternatively,the coupling unit 125 d may be coupled to a structure formed on thefront cover 105 and/or the back cover 150. Namely, the coupling unit 125d may be indirectly coupled to the front cover 105 and/or the back cover150.

The optical layer 123 may include the light source, etc. The detailedconfiguration of the optical layer 123 will be described in thecorresponding paragraphs.

The frame 130 may support components constituting the display device100. For example, the frame 130 may be coupled to the backlight unit120. The frame 130 may be formed of a metal material, for example, analuminum alloy.

The back cover 150 may be positioned at a back surface of the displaydevice 100. The back cover 150 may protect inner configuration of thedisplay device 100 from the outside. At least a portion of the backcover 150 may be coupled to the frame 130 and/or the front cover 105.The back cover 150 may be an injection production (or injection molded)formed of a resin material.

FIG. 4 shows the configuration of the optical sheet 125.

As shown in (a) of FIG. 4, the optical sheet 125 and/or a diffusionplate 129 may be positioned on the frame 130. The optical sheet 125and/or the diffusion plate 129 may be coupled to the frame 130 at anedge of the frame 130. The optical sheet 125 and/or the diffusion plate129 may be directly placed at the edge of the frame 130. Namely, anouter perimeter of the optical sheet 125 and/or the diffusion plate 129may be supported by the frame 130. An upper surface of an edge of theoptical sheet 125 and/or the diffusion plate 129 may be surrounded by afirst guide panel 117. For example, the optical sheet 125 and/or thediffusion plate 129 may be positioned between the edge of the frame 130and a flange 117 a of the first guide panel 117.

The display panel 110 may be positioned at a front surface of theoptical sheet 125. An edge of the display panel 110 may be coupled tothe first guide panel 117. Namely, the display panel 110 may besupported by the first guide panel 117.

An edge area of the front surface of the display panel 110 may besurrounded by the front cover 105. For example, the display panel 110may be positioned between the first guide panel 117 and the front cover105.

As shown in (b) of FIG. 4, the display device 100 according to theembodiment of the invention may further include a second guide panel113. The optical sheet 125 and/or the diffusion plate 129 may be coupledto the second guide panel 113. Namely, the second guide panel 113 mayhave a shape, in which the second guide panel 113 is coupled to theframe 130 and the optical sheet 125 and/or the diffusion plate 129are/is coupled to the second guide panel 113. The second guide panel 113may be formed of a material different from the frame 130. The frame 130may have a shape surrounding the first and second guide panels 117 and113.

As shown in (c) of FIG. 4, in the display device 100 according to theembodiment of the invention, the front cover 105 may not cover the frontsurface of the display panel 110. Namely, one end of the front cover 105may be positioned on the side of the display panel 110.

Referring to FIGS. 5 and 6, the backlight unit 120 may include theoptical layer 123 including substrates 122, at least one light assembly124, a reflecting sheet 126 and the diffusion plate 129, and the opticalsheet 125 positioned on a front surface of the optical layer 123.

The substrates 122 may include a plurality of straps, which extend in afirst direction and are separated from one another by a predetermineddistance in a second direction perpendicular to the first direction.

At least one light assembly 124 may be mounted on the substrate 122. Thesubstrate 122 may have an electrode pattern for connecting an adaptor tothe light assembly 124. For example, a carbon nanotube electrode patternfor connecting the adaptor to the light assembly 124 may be formed onthe substrate 122.

The substrate 122 maybe formed of at least one ofpolyethyleneterephthalate (PET), glass, polycarbonate (PC), and silicon.The substrate 122 maybe a printed circuit board (PCB), on which at leastone light assembly 124 is mounted.

The light assemblies 124 may be disposed on the substrate 122 atpredetermined intervals in the first direction. A diameter of the lightassembly 124 may be greater than a width of the substrate 122. Namely,the diameter of the light assembly 124 may be greater than a length ofthe substrate 122 in the second direction.

The light assembly 124 may be one of a light emitting diode (LED) chipand a LED package having at least one LED chip.

The light assembly 124 may be configured as a colored LED emitting atleast one of red, green, and blue light or a white LED. The colored LEDmay include at least one of a redLED, a greenLED, and a blueLED.

The light source included in the light assembly 124 may be aCOB(Chip-On-Board) type. The COB light source may have a configuration,in which the LED chip as the light source is directly coupled to thesubstrate 122. Thus, the process may be simplified. Further, aresistance may be reduced, and a loss of energy resulting from heat maybe reduced. Namely, power efficiency of the light assembly 124 mayincrease. The COB light source can provide the brighter lighting and maybe implemented to be thinner and lighter than a related art.

The reflecting sheet 126 may be positioned at the front surface of thesubstrate 122. The reflecting sheet 126 may be positioned in an areaexcluding a formation area of the light assemblies 124 of the substrates122. Namely, the reflecting sheet 126 may have a plurality of holes 235.

The reflecting sheet 126 may reflect light emitted from the lightassembly 124 to a front surface of the reflecting sheet 126. Further,the reflecting sheet 126 may again reflect light reflected from thediffusion plate 129.

The reflecting sheet 126 may include at least one of metal and metaloxide which are a reflection material. The reflecting sheet 126 mayinclude metal and/or metal oxide having a high reflectance, for example,aluminum (Al), silver (Ag), gold (Au), and titanium dioxide (TiO₂).

The reflecting sheet 126 may be formed by depositing and/or coating themetal or the metal oxide on the substrate 122. An ink including themetal material may be printed on the reflecting sheet 126. On thereflecting sheet 126, a deposition layer may be formed using a heatdeposition method, an evaporation method, or a vacuum deposition methodsuch as a sputtering method. On the reflecting sheet 126, a coatinglayer and/or a printing layer may be formed using a printing method, agravure coating method or a silk screen method.

An air gap may be positioned between the reflecting sheet 126 and thediffusion plate 129. The air gap may serve as a buffer capable of widelyspreading light emitted from the light assembly 124. A supporter (orsupport plate) 200 may be positioned between the reflecting sheet 126and the diffusion plate 129, so as to maintain the air gap.

A resin may be deposited on the light assembly 124 and/or the reflectingsheet 126. The resin may function to diffuse light emitted from thelight assembly 124.

The diffusion plate 129 may upwardly diffuse light emitted from thelight assembly 124.

The optical sheet 125 may be positioned at a front surface of thediffusion plate 129. A back surface of the optical sheet 125 may beadhered to the diffusion plate 129, and a front surface of the opticalsheet 125 may be adhered to the back surface of the display panel 110.

The optical sheet 125 may include at least one sheet. More specifically,the optical sheet 125 may include one or more prism sheets and/or one ormore diffusion sheets. The plurality of sheets included in the opticalsheet 125 may be attached and/or adhered to one another.

In other words, the optical sheet 125 may include a plurality of sheetshaving different functions. For example, the optical sheet 125 mayinclude first to third optical sheets 125 a to 125 c. The first opticalsheets 125 a may function as a diffusion sheet, and the second and thirdoptical sheets 125 b and 125 c may function as a prism sheet. A numberand/or a position of the diffusion sheets and the prism sheets may bechanged. For example, the optical sheet 125 may include the firstoptical sheets 125 a as the diffusion sheet and the second optical sheet125 b as the prism sheet.

The diffusion sheet may prevent light coming from the diffusion platefrom being partially concentrated and may homogenize a luminance of thelight. The prism sheet may concentrate light coming from the diffusionsheet and may make the concentrated light be vertically incident on thedisplay panel 110.

The coupling unit 125 d may be formed on at least one of corners of theoptical sheet 125. The coupling unit 125 d may be formed in at least oneof the first to third optical sheets 125 a to 125 c.

The coupling unit 125 d may be formed at the corner on the long side ofthe optical sheet 125. The coupling unit 125 d formed on the first longside and the coupling unit 125 d formed on the second long side may beasymmetric. For example, a number and/or a position of the couplingunits 125 d formed on the first long side may be different from a numberand/or a position of the coupling units 125 d formed on the second longside.

Referring to FIG. 7, the substrates 122 including the plurality ofstraps, which extend in the first direction and are separated from oneanother by a predetermined distance in the second directionperpendicular to the first direction, may be provided on the frame 130.One end of each of the plurality of substrates 122 may be connected to aline electrode 232.

The line electrode 232 may extend in the second direction. The lineelectrode 232 may be connected to the ends of the substrates 122 atpredetermined intervals in the second direction. The substrates 122 maybe electrically connected to the adaptor through the line electrode 232.

The light assemblies 124 may be mounted on the substrate 122 atpredetermined intervals in the first direction. A diameter of the lightassembly 124 may be greater than a width of the substrate 122 in thesecond direction. Hence, an outer area of the light assembly 124 may bepositioned beyond a formation area of the substrate 122.

FIGS. 8 and 9 show a light source according to the embodiment of theinvention.

As shown in FIG. 8, a light source 203 may be a COB light source. TheCOB light source 203 may include at least one of an emission layer 135,first and second electrodes 147 and 149, and a fluorescent layer 137.

The emission layer 135 may be positioned on the substrate 122. Theemission layer 135 may emit one of red, green, and blue light. Theemission layer 135 may include one of Firpic, (CF3ppy)2Ir(pic),9,10-di(2-naphthy)anthracene(AND), perylene, distyrybiphenyl, PVK,OXD-7, UGH-3(Blue), and a combination thereof.

The first and second electrodes 147 and 149 may be positioned on bothsides of a lower surface of the emission layer 135. The first and secondelectrodes 147 and 149 may transmit an external driving signal to theemission layer 135.

The fluorescent layer 137 may cover the emission layer 135 and the firstand second electrodes 147 and 149. The fluorescent layer 137 may includea fluorescent material converting light of a spectrum generated from theemission layer 135 into white light. A thickness of the emission layer135 on the fluorescent layer 137 may be uniform. The fluorescent layer137 may have a refractive index of 1.4 to 2.0.

The COB light source 203 according to the embodiment of the inventionmay be directly mounted on the substrate 122. Thus, the size of thelight assembly 124 may decrease.

Because heat dissipation of the light sources 203 is excellent byforming the light sources 203 on the substrate 122, the light sources203 may be driven at a high current. Hence, a number of light sources203 required to secure the same light quantity may decrease.

Further, because the light sources 203 are mounted on the substrate 122,a wire bonding process may not be necessary. Hence, the manufacturingcost may be reduced due to the simplification of the manufacturingprocess.

As shown in FIG. 9, the light source 203 according to the embodiment ofthe invention may emit light in a first emission range EA1. Namely, thelight source 203 may emit light in the first emission range EA1including a second emission range EA2 of the front side and third andfourth emission ranges EA3 and EA4 of both sides. Thus, the light source203 according to the embodiment of the invention is different from arelated art POB light source emitting light in the second emission rangeEA2. In other words, the light source 203 according to the embodiment ofthe invention may be the COB light source, and the COB light source 203may emit light in a wide emission range including the side.

Because the COB light source 203 emits light even in a directioncorresponding to the third and fourth emission ranges EA3 and EA4 of theside, the embodiment of the invention needs to efficiently control lightof the side direction. The reflecting sheet according to the embodimentof the invention may control a reflectance of light emitted from thelight source 203 in the side direction. Thus, the embodiment of theinvention may reduce the non-uniformity of brightness resulting fromlight of the side direction.

FIG. 10 illustrates a connection relationship between the reflectingsheet and components around the reflecting sheet according to theembodiment of the invention.

As shown in FIG. 10, the reflecting sheet 126 according to theembodiment of the invention may be placed on the frame 130. For example,the reflecting sheet 126 may be coupled to a receiving unit 132 formedinside the frame 130.

The reflecting sheet 126 may include a horizontal coupling unit HH and avertical coupling unit VH. For example, coupling holes may be formedalong a long side and/or a short side of the reflecting sheet 126.

The horizontal coupling unit HH and the vertical coupling unit VH may beinserted into a horizontal protrusion 130H and/or a vertical protrusion130V formed on the frame 130. A guide panel GP may be formed on thereflecting sheet 126.

The guide panel GP may be formed of plastic material of injectionmolding or press processed metal material. The guide panel GP may becoupled to the horizontal protrusion 130H and/or the vertical protrusion130V. When the guide panel GP is coupled to the reflecting sheet 126,the reflecting sheet 126 may be fixed between the frame 30 and the guidepanel GP. FIG. 10 shows that the long sides and the short sides of theguide panel GP are separated from one another, as an example. The guidepanel GP, which the long sides and the short sides are connected to oneanother, may be used.

The reflecting sheet 126 placed on the frame 130 may be configured as athree-dimensional shape corresponding to a shape of the receiving unit132. Even when the reflecting sheet 126 according to the embodiment ofthe invention has the three-dimensional shape, the reflecting sheet 126can provide an optimum reflection effect. For example, the reflectingsheet 126 can uniformly reflect light throughout its entire area.

The reflecting sheet 126 may constitute a portion of the backlight unit120 (refer to FIG. 5). The substrate 122, on which the light sources 203are mounted, may be positioned between the reflecting sheet 126 and theframe 130.

The plurality of substrates 122 may be arranged in the horizontaldirection and/or the vertical direction. The substrates 122 may beconnected to signal lines 121 connected to a controller, etc., of thedisplay device 100. The signal lines 121 may be connected to thesubstrates 122 through holes formed in the frame 130.

The reflecting sheet 126 may include a plurality of lens holes 235. Theplurality of lens holes 235 may correspond to the light sources 203 onthe substrate 122. For example, the plurality of lens holes 235 may bearranged in the horizontal direction and/or the vertical directioncorrespondingly to the light sources 203. A lens 124 b may be insertedinto the lens hole 235. For example, the lens 124 b may be coupled tothe light source 203 through the lens hole 235.

The reflecting sheet 126 may include a plurality of support holes (orsupport plate holes) 205. A supporter 200 may be coupled to the supporthole 205. The supporter 200 may support the optical sheet 125 and/or thediffusion plate 129 positioned in front of the reflecting sheet 126.Namely, the reflecting sheet 126 may be separated from the optical sheet125 and/or the diffusion plate 129 at a predetermined distance.

The reflecting sheet 126 may include a plurality of fixing pin holes206. A fixing pin 202 may be coupled to the fixing pin hole 206. Also,the fixing pin 202 may be coupled to a frame hole 204 formed in theframe 130. Thus, the fixing pin 202 may fix the reflecting sheet 126 tothe frame 130.

FIGS. 11 to 13 illustrate configuration of the reflecting sheetaccording to the embodiment of the invention.

As shown in FIGS. 11 to 13, the reflecting sheet 126 according to theembodiment of the invention may be placed in an inner area of the frame130. The reflecting sheet 126 placed on the frame 130 may have thethree-dimensional shape corresponding to a shape of the frame 130.

As shown in FIG. 11, the frame 130 may include first to third frameareas 130 a to 130 c.

The first frame area 130 a may be a bottom surface of the frame 130. Thesecond frame area 130 b may be substantially flat. Namely, the secondframe area 130 b may be a surface positioned on an X-Y plane of thedisplay device 100.

The second frame area 130 b may be a sidewall surface extended upwardlyfrom the first frame area 130 a. The second frame area 130 b may extendin a direction parallel to a Z-axis direction or a direction inclined tothe Z-axis direction. The receiving unit 132 (refer to FIG. 10) may beformed inside the frame 130 by the second frame area 130 b serving as asidewall of the frame 130.

The third frame area 130 c may be a surface extended from the secondframe area 130 b in an X-axis direction. The third frame area 130 c maybe substantially parallel to the first frame area 130 a. Namely, thethird frame area 130 c may be a flat surface in the same manner as thefirst frame area 130 a at a height level different from the first framearea 130 a by the second frame area 130 b.

The third frame area 130 c may include a protruding area. The thirdframe area 130 c may be coupled to a protrusion formed through aseparate process. The protruding area and/or the protrusion of the thirdframe area 130 c may be coupled to the reflecting sheet 126. Forexample, the protruding area and/or the protrusion of the third framearea 130 c may be coupled to a third sheet area 126 c of the reflectingsheet 126. The protruding area and/or the protrusion of the third framearea 130 c may be coupled to the optical sheet 125 (refer to FIG. 5).

The reflecting sheet 126 may be coupled to an area formed by the firstto third frame areas 130 a to 130 c of the frame 130. For example, thereflecting sheet 126 may be coupled to the first frame area 130 athrough the fixing pin 202. When a portion of the reflecting sheet 126is coupled to the first frame area 130 a through the fixing pin 202, theportion of the reflecting sheet 126 may naturally contact the frame 130.

When the reflecting sheet 126 is coupled to the frame 130 through thefixing pin 202, the shape of the reflecting sheet 126 may be naturallychanged depending on the shape of the frame 130. Namely, a naturallyrounded second sheet area 126 b of the reflecting sheet 126 may beformed. Thus, a separate process for forming a chamfer of the reflectingsheet 126 may not be necessary, and workability may be improved.

The reflecting sheet 126 may include first to third sheet areas 126 a to126 c. Namely, an area of the reflecting sheet 126 may be divideddepending on whether or not the reflecting sheet 126 and the frame 130contact each other. For example, the area of the reflecting sheet 126may be divided into a contact area contacting the frame 130 and anon-contact area not contacting the frame 130.

The area of the reflecting sheet 126 may be divided into the first sheetarea 126 a and the second sheet area 126 b by the fixing pin 202. Inother words, the second sheet area 126 b may be an area between thefixing pin 202 and a portion contacting the third frame area 130 c,Namely, the first sheet area 126 a and the second sheet area 126 b maybe determined depending on whether or not the reflecting sheet 126contacts the first frame area 130 a of the frame 130. The second sheetarea 126 b may be naturally separated from the frame 130 by propertiesand elasticity of the reflecting sheet 126. For example, when the firstsheet area 126 a is coupled to the frame 130 by the fixing pin 202, thesecond sheet area 126 b may naturally form a curved surface by its ownweight and may be separated from the frame 130. A separation space 130 dmay be formed between the second sheet area 126 b and the frame 130. Anangle formed by the second sheet area 126 b of the reflecting sheet 126and the bottom surface of the frame 130 may gradually increase. Namely,in the non-contact area of the reflecting sheet 126, the reflectingsheet 126 may have a two-dimensional curve shape. Thus, the second sheetarea 126 b may be separated from the frame 130 at a predetermined angle.

The third sheet area 126 c may be placed in the third frame area 130 c.The third sheet area 126 c may be coupled to the third frame area 130 c.Alternatively, the third sheet area 126 c may be naturally positioned onthe third frame area 130 c. Namely, the third sheet area 126 c maycontact the third frame area 130 c by elastic force of the Z-axisdirection resulting from the rounded second sheet area 126 b.

Light L may be emitted through the lens 124 b. Namely, light generatedin the light source 203 may be emitted to the outside through the lens124 b. The light L emitted through the lens 124 b may travel throughvarious paths. For example, a portion of the light L may travel througha path of the side direction of the lens 124 b.

The portion of the light L in the path of the side direction may traveltoward the second sheet area 126 b. At least a portion of lightgenerated in the light source 203 may be totally reflected inside thelens 124 b and may travel toward the second sheet area 126 b. In thisinstance, an amount of light L upwardly travelling in the second sheetarea 126 b may be more than an amount of light L downwardly travellingin the second sheet area 126 b. In other words, an amount and/or adensity of light L transferred to the reflecting sheet 126 may benon-uniform. When the amount and/or the density of the light L is notuniform, a viewer watching the display device 100 may perceivenon-uniformity of the amount and/or the density of the light L. Forexample, when an amount of light L incident on an upper portion of thesecond sheet area 126 b is more than an amount of light L incident on alower portion of the second sheet area 126 b, a corresponding area maybe recognized as being brighter than other areas because of the light Lreflected from the upper portion of the second sheet area 126 b.

As shown in FIG. 12, an angle formed by an extension line from aboundary between the first sheet area 126 a and the second sheet area126 b to a boundary between the second sheet area 126 b and the thirdsheet area 126 c and two straight lines parallel to the X-axis directionmay be called “A”. An inclined angle of the second sheet area 126 busing an intersection point P between the second sheet area 126 b and astraight line of the angle A as a starting point may increase. Namely,an angle of the second sheet area 126 b passing the intersection point Pin the X-axis direction may sharply increase.

Because the angle of the second sheet area 126 b passing theintersection point P increases, a density of the light L emitted fromthe lens 124 b (refer to FIG. 11) per unit area may further increase.Thus, a corresponding portion may be seen as being brighter than otherportions. As a result, the viewer may feel that the light is notuniform. The display device 100 according to the embodiment of theinvention can make light be uniformly reflected from the reflectingsheet 126. Hence, the viewer cannot feel or can feel less thenon-uniformity of the light.

As shown in FIG. 13, in the display device 100 according to theembodiment of the invention, dots DT may be formed in at least a portionof the reflecting sheet 126.

The dot DT may be an area having a pattern different from other areas.The dot DT may be an area of uneven portions (or concave-convexportions)formed on the reflecting sheet 126. The dot DT may be an area,in which at least a portion of the reflecting sheet 126 is colored. Forexample, the dot DT may be an area of a relatively dark color. Forexample, the dot DT may be a black or gray area. The dot DT may be anarea, in which the uneven portion and the colored portion are mixed witheach other. The dot DT may have a geometric shape, in which there is adifference in at least one of a shape, a size, a location, and a color.For example, the dot DT may be one of various shapes including a circle,an oval, a rectangle, a rod, a triangle, etc., formed on the reflectingsheet 126 and/or a combination of the various shapes.

The dots DT may affect a reflectance of a corresponding area. Namely,the dots DT may change a reflectance of light. For example, thereflectance of light may be reduced depending on at least one of ashape, a size, a location, and a color of the dot DT. The plurality ofdots DT may gather (or arranged) and form a dot area DA.

The dot area DA may be a gathering (or arranging) of the dots DT.Namely, the dot area DA may be a formation area of the plurality of dotsDT, which are the same as or different from one another in at least oneof a shape, a size, a location, and a color. For example, the dot areaDA may be formed in at least a portion of the second sheet area 126 b.As described above, a density of light per unit area in the second sheetarea 126 b may be high because of the inclined shape of the second sheetarea 126 b. The dot area DA may change a reflectance of light incidenton the second sheet area 126 b. In other words, a density of incidentlight per unit area is high, but a density of reflected light per unitarea may decrease. Thus, a phenomenon, in which a contrast of a portioncorresponding to the second sheet area 126 b is different from acontrast of other portions, may be prevented. Namely, light can beuniformly reflected from the entire reflecting sheet 126 because of thedot area DA. The dots DT constituting the dot area DA may be dividedinto a plurality of groups having different attributes. For example, aformation area of dots having a first attribute may be called a firstarea, and a formation area of dots having a second attribute may becalled a second area. Hereinafter, the dot area DA may be displayed bychanging the color, the density, etc., of the reflecting sheet 126, andareas having the different colors, densities, etc., may be formationareas of dots having different attributes even if a separate explanationis not given. For example, dots having different attributes may bedisposed in an area with a first color and an area with a second color.Namely, dots, which are different from one another in at least one ofthe size, the density, the color, and the interval, may be disposed indifferent areas.

The reflecting sheet 126 may further include anon-dot area NDA. Thenon-dot area NDA may be an area, in which there is no dot DT. Thenon-dot area NDA may be positioned in various areas of the reflectingsheet 126. For example, the non-dot area NDA may include first andsecond non-dot areas NDA1 and NDA2.

A width of the non-dot area NDA may be greater than a distance betweenadjacent dots. Namely, the width of the non-dot area NDA in a directionfrom the first sheet area 126 a to the third sheet area 126 c may begreater than a distance between two dots adjacent to the non-dot areaNDA. The width of the non-dot area NDA may be equal to or greater than 2mm.

The second non-dot area NDA2 may be positioned at a boundary between thesecond sheet area 126 b and the third sheet area 126 c. The secondnon-dot area NDA2 may be positioned in the second sheet area 126 b atthe boundary between the second sheet area 126 b and the third sheetarea 126 c.

The second non-dot area NDA2 may be an uppermost area of the secondsheet area 126 b and thus may be close to the optical sheet 125 and/orthe diffusion plate 129 positioned in front of the reflecting sheet 126.Hence, if the dot DT exists in the second non-dot area NDA2, the user ofthe display device 100 may observe the dot DT. Thus, the dot DT may notexist in the second non-dot area NDA2.

FIGS. 14 to 17 illustrate a dot distribution of the reflecting sheetaccording to the embodiment of the invention.

As shown in FIGS. 14 to 17, the dots DT of the reflecting sheet 126according to the embodiment of the invention may be disposed in variousshapes.

As shown in (a) of FIG. 14, the dots DT may be disposed in the dot areaDA. The adjacent dots DT may be separated from each other by a firstdistance O1. Namely, the dots DT may be disposed at regular intervals ofthe first distance O1.

The distance between the dots DT may affect the reflectance of thereflecting sheet 126. For example, when the distance between the dots DTdecreases, the reflectance may decrease.

As shown in (b) of FIG. 14, the adjacent dots DT may be separated fromeach other by the first distance O1, and the adjacent dots DT may beseparated from each other by a second distance O2. Namely, a distancebetween the dots DT may not be uniform

As shown in (a) of FIG. 15, the dot area DA may be divided into aplurality of areas. For example, the dot area DA may be divided into afirst area P1 and a second area P2. An attribute of dots DT included inthe first area P1 may be different from an attribute of dots DT includedin the second area P2. For example, at least one of a size, a density,and a color of a first dot DT1 in the first area P1 may be differentfrom at least one of a size, a density, and a color of a second dot DT2in the second area P2.

The second area P2 may be positioned further outside than the first areaP1. Namely, the second area P2 may be an area close to the third sheetarea 126 c. The second dot DT2 of the second area P2 may be larger thanthe first dot DT1 of the first area P1. Thus, a reflectance of thesecond area P2 may be less than a reflectance of the first area P1.

As shown in (b) of FIG. 15, the dot area DA may be divided into aplurality of areas. For example, the dot area DA may be divided intofirst to third areas P1 to P3. First to third dots DP1 to DP3 of thefirst to third areas P1 to P3 may have different attributes. Forexample, the second dot DT2 may be larger than the first dot DT1, andthe third dot DT3 may be larger than the second dot DT2. Alternatively,the first to third dots DP1 to DP3 have the same size, but a density ofthe first area P1 may be different from a density of the second area P2,and a density of the second area P2 may be different from a density ofthe third area P3. For example, the density of the first area P1 may beless than the density of the second area P2, and the density of thesecond area P2 may be less than the density of the third area P3.

As shown in FIG. 16, the dot area DA may not be divided into a pluralityof areas. However, dots DT included in the dot area DA may be differentfrom each other in at least one of a size, a density, and a color. Forexample, as the dot DT goes along the X-axis direction, the size of thedot DT may gradually increase. Namely, an attribute of the dot DTincluding at least one of the size, the density, and the color maygradually change.

As shown in (a) of FIG. 17, a size of the dot DT may gradually changedepending on a location.

As shown in (b) of FIG. 17, a size of the dot DT may sharply changedepending on a location. For example, the size of the dot DT may bechanged in a curve shape of a quadratic function.

FIGS. 18 to 25 illustrate configuration related to a lens hole of areflecting sheet according to an example embodiment of the invention.

As shown in FIGS. 18 to 25, the reflecting sheet 126 according to theembodiment of the invention may include the lens hole 235 of variousshapes and/or various dispositions capable of controlling a reflectionamount of light.

As shown in FIG. 18, at least one of the lens holes 235 may include afirst lens hole 235 a.

The first lens hole 235 a may not have a circular shape (or a perfectlycircular shape). The first lens hole 235 a may have a shape, in which aradius is changed. The first lens hole 235 a may have a shape, in whicha radius is successively changed. For example, the first lens hole 235 aof an oval shape may be used. The first lens hole 235 a may have ashape, in which a radius is non-successively changed. For example, thefirst lens hole 235 a may have a combination shape of a circle of afirst radius R1 and a circle of a second radius R2. The second radius R2may be an area corresponding to an angle AA. The angle AA may be lessthan 180 degrees. Namely, the area corresponding to the angle AA mayhave a fan shape of the second radius R2. In other words, a width of thearea corresponding to the angle AA may be less than widths of otherareas. In other words, the first lens hole 235 a may include a lineararea and a curved area. For example, the first lens hole 235 a mayinclude a curved area of the first and second radii R1 and R2 and alinear area connecting the first and second radii R1 and R2.

As described above, the second radius R2 may be greater than the firstradius R1. Thus, a portion of light emitted through the first lens hole235 a may be emitted from the area corresponding to the angle AA to therear of the reflecting sheet 126. A total amount of light reflected ontothe front of the reflecting sheet 126 by the reflecting sheet 126 maydecrease by an amount of light emitted to the rear of the reflectingsheet 126.

An area corresponding to the second radius R2 of the first lens hole 235a may face a chamber area CSA. Namely, the area corresponding to thesecond radius R2 of the first lens hole 235 a may face an outerperipheral of the reflecting sheet 126. In other words, the areacorresponding to the second radius R2 of the first lens hole 235 a mayface the second sheet area 126 b (refer to FIG. 13). As described above,because a portion of light is emitted to the rear of the reflectingsheet 126 by the second radius R2, an influence of the first lens hole235 a on the chamber area CSA may be less than an influence of thegeneral lens hole 235. Thus, the chamber area CSA may be prevented frombeing brighter than other area.

As shown in FIG. 19, the lens hole 235 may include a first lens hole 235a, of which a radius is changed, and a circular second lens hole 235 b.

The first lens hole 235 a may be positioned on the upper, left, right,and lower sides of the disposed lens holes 235. As described above, thedisposition of the first lens hole 235 a may prevent the upper, left,right, and lower sides of the lens hole 235 from being brighter thanother area.

As shown in (a) of FIG. 20, a third ring-shapeddot area CDT3 may beformed in a first lens hole 235 having an overlap shape of circles eachhaving a different radius. For example, the third ring-shapeddot areaCDT3 may be formed in a circle having a large second radius R2. Forexample, the third ring-shapeddot area CDT3 may be formed in at least aportion of the circle having the second radius R2.

As shown in (b) of FIG. 20, when the shape of the first lens hole 235 ischanged, a location of the third ring-shapeddot area CDT3 may be changedin accordance with the first lens hole 235.

The third ring-shapeddot area CDT3 shown in (a) of FIG. 20 may bedifferent from the third ring-shapeddot area CDT3 shown in (b) of FIG.20. For example, a size of the third ring-shapeddot area CDT3 shown in(a) of FIG. 20 may be different from a size of the third ring-shapeddotarea CDT3 shown in (b) of FIG. 20. For example, the size of the thirdring-shapeddot area CDT3 shown in (a) of FIG. 20 may be larger than thesize of the third ring-shapeddot area CDT3 shown in (b) of FIG. 20. Thethird ring-shapeddot area CDT3 shown in (a) of FIG. 20 may be a dot areacorresponding to the horizontal dot area HDA, and the thirdring-shapeddot area CDT3 shown in (b) of FIG. 20 may be a dot areacorresponding to the vertical dot area VDA. Namely, the size of thethird ring-shapeddot area CDT3 formed around the lens hole adjacent tothe horizontal dot area HDA may be different from the size of the thirdring-shapeddot area CDT3 formed around the lens hole adjacent to thevertical dot area VDA.

The dots included in the third ring-shapeddot area CDT3 may beconfigured in various combinations. For example, the dots of the thirdring-shapeddot area CDT3 may have the same size. For example, the dotsof the third ring-shapeddot area CDT3 may include at least two differentkinds of dots. For example, as the dot is far away from the lens hole235, the size of the dot may decrease or increase. For example, a sizeand/or a kind of the dot in one portion of the third ring-shapeddot areaCDT3 may be different from a size and/or a kind of the dot in anotherportion of the third ring-shapeddot area CDT3.

As shown in FIG. 21, the dot area DA may be formed in various shapes.Namely, the dot area DA of the various shapes may be configured so thatthe reflecting sheet 126 uniformly reflects light. For example, the dotarea DA may be formed around the lens hole 235. For example, the dotarea DA may be formed in at least a partial area around the lens hole235. For example, the dot area DA may have the shape surrounding thelens hole 235. Namely, a first circular dot area CDT1 may be formed.

The first ring-shapeddot area CDT1 may have the shape surrounding thelens hole 235. For example, the first ring-shapeddot area CDT1 may havethe shape, in which the dots DT of the same size and/or the same shapesurround the lens hole 235. For example, the first ring-shapeddot areaCDT1 may have the shape, in which the dots DT, of which at least apartial size and/or shape is different, surround the lens hole 235.

A reflectance of a corresponding area may be changed by the firstring-shapeddot area CDT1. For example, a reflectance of a formation areaof the first ring-shapeddot area CDT1 may be reduced. Thus, the firstring-shapeddot area CDT1 may be formed around a specific lens hole 235,which needs to reduce the reflectance.

The horizontal dot area HDA and/or the vertical dot area VDA may includea plurality of areas, in which attributes of the dots are different fromone another. For example, the horizontal dot area HDA may include firstto third horizontal dot areas HDA1 to HDA3, and the vertical dot areaVDA may include first to third vertical dot areas VDA1 to VDA3. Theremay be a difference between the dots of the areas in at least one of asize, an interval, a density, and a color of the dot. For example, thesize of the dot in the first horizontal dot area HDA1 may be less thanthe size of the dot in the second horizontal dot area HDA2, and the sizeof the dot in the second horizontal dot area HDA2 may be less than thesize of the dot in the third horizontal dot area HDA3, or vice versa.The configuration of the first to third horizontal dot areas HDA1 toHDA3 may be equally applied to the first to third vertical dot areasVDA1 to VDA3.

As shown in FIG. 22, the reflecting sheet 126 may include a plurality oflens holes 235. The first ring-shapeddot area CDT1 may be formed in aspecific lens hole 235 among the plurality of lens holes 235. Forexample, the plurality of lens holes 235 may include a first lens hole235 a, in which the first ring-shapeddot area CDT1 is formed, and asecond lens hole 235 b, in which the first ring-shapeddot area CDT1 isnot formed. The first lens hole 235 a having the first ring-shapeddotarea CDT1 may be the lens hole 235 positioned on the outside among theplurality of lens holes 235 a. Namely, the first ring-shapeddot areaCDT1 may be formed in the outermost lens hole 235. This may be becausethe first lens hole 235 a positioned on the outside is close to thebending second sheet area 126 b (refer to FIG. 13) of the reflectingsheet 126. Namely, the first ring-shapeddot area CDT1 may be formed inthe first lens hole 235 a, so as to prevent an excessively large amountof light from being reflected from the second sheet area 126 b.

As shown in (a) of FIG. 23, a first ring-shapeddot area CDT1 may beformed around the lens hole 235. The first ring-shapeddot area CDT1 maybe dots DT surrounding the lens hole 235. The first ring-shapeddot areaCDT1 may be dots DT surrounding the lens hole 235 one time. The dots DTconstituting the first ring-shapeddot area CDT1 may have the same sizeand/or the same shape. Alternatively, at least a portion of the dots DTconstituting the first ring-shapeddot area CDT1 may have different sizesand different shapes. For example, a size of the dot DT positioned inthe outside direction of the reflecting sheet 126 may be greater than asize of the dot DT positioned in the inside direction of the reflectingsheet 126.

As shown in (b) of FIG. 23, a second ring-shapeddot area CDT2 may beformed around the lens hole 235. The second ring-shapeddot area CDT2 maybe dots DT surrounding the lens hole 235 several times (several loops ornested). This is a difference between the first ring-shapeddot area CDT1surrounding the lens hole 235 one time and the second ring-shapeddotarea CDT2.

As shown in (c) of FIG. 23, a third ring-shapeddot area CDT3 may beformed around the lens hole 235. The third ring-shapeddot area CDT3 maybe formed around a predetermined portion of the lens hole 235. Forexample, the third ring-shapeddot area CDT3 may be formed in a portioncorresponding to an angle AC in the lens hole 235. The thirdring-shapeddot area CDT3 may surround the portion corresponding to theangle AC one time or several times.

As shown in (d) of FIG. 23, a fourth ring-shapeddot area CDT4 may beformed around the lens hole 235. A density of dots of the fourthring-shapeddot area CDT4 may vary depending on a location. For example,the dots may have the same size, but a distance between the dots may bechanged. For example, a distance between the dots positioned close tothe lens hole 235 may be relatively short, and a distance between thedots positioned far away from the lens hole 235 may be relatively long.

As shown in (a) of FIG. 24, a fourth ring-shapeddot area CDT4 may beformed around at least a portion of the lens hole 235. The fourthring-shapeddot area CDT4 may be dots DT positioned in a portioncorresponding to an angle AC in the lens hole 235. The fourthring-shapeddot area CDT4 may be separated from the lens hole 235.Namely, the fourth ring-shapeddot area CDT4 may be formed at a locationwhich is separated from a boundary of the lens hole 235 by apredetermined distance.

As shown in (b) of FIG. 24, a fifth ring-shapeddot area CDT5 may beformed around at least a portion of the lens hole 235. The fifthring-shapeddot area CDT5 may include a first dot area DT1 and a seconddot area DT2. An attribute of a dot constituting the first dot area DT1may be different from an attribute of a dot constituting the second dotarea DT2. For example, sizes of the dots constituting the first andsecond dot areas DT1 and DT2 may be different from each other. Forexample, a size of the dot constituting the second dot area DT2 may begreater than a size of the dot constituting the first dot area DT1. Anarea corresponding to the second dot area DT2 may be an area which canemit a larger amount of light than the lens positioned in the lens hole235. Thus, the second dot area DT2 may be formed, so as to furtherreduce a reflectance of the fifth ring-shapeddot area CDT5 than otherareas.

As shown in (c) of FIG. 24, the lens hole 235 may be a first lens hole235 a, which is not circular. As described above, a radius of at least aportion of the first lens hole 235 a may be different from a radius ofat least another portion of the first lens hole 235 a. The first lenshole 235 a may cause a portion of light to be emitted downwardly fromthe reflecting sheet 126, thereby controlling an amount of the light.

A sixth ring-shapeddot area CDT6 may be formed in an area AC. The areaAC may be an area having a relatively large radius in the first lenshole 235 a. For example, the sixth ring-shapeddot area CDT6 may beformed in an area having a radius R2. An amount of light emitted and/orreflected in a specific direction may be efficiently controlled by thearea having the radius R2 and the sixth ring-shapeddot area CDT6.

As shown in (d) of FIG. 24, the lens hole 235 may be a first lens hole235 a, which is not circular. A sixth ring-shapeddot area CDT6 and aseventh ring-shapeddot area CDT7 may be formed around the first lenshole 235 a. The sixth ring-shapeddot area CDT6 and the seventhring-shapeddot area CDT7 may surround the first lens hole 235 a.

As shown in FIG. 25, the plurality of lens holes 235 may include firstlens holes 235 a and second lens holes 235 b. A third ring-shapeddotarea CDT3 may be formed in the first lens hole 235 a. A radius of thefirst lens hole 235 a may be changed. The first lens hole 235 a may bepositioned on the outside of the plurality of lens holes 235. Forexample, the first lens hole 235 a may be a lens hole 235 positioned inan area close to the long side and/or the short side. For example, thefirst lens hole 235 a may be a lens hole 235 positioned adjacent to ahorizontal dot area HDA and/or a vertical dot area VDA. Namely, thethird ring-shapeddot area CDT3 may be positioned between the first lenshole 235 a and the horizontal dot area HDA and/or the vertical dot areaVDA. Thus, an excessively large amount of light may be prevented frombeing reflected from the second sheet area 126 b (refer to FIG. 11) ofthe reflecting sheet 126.

FIGS. 26 to 30 illustrate configuration related to a lens holereflecting sheet according to an example embodiment of the invention.

As shown in FIGS. 26 to 30, the display device 100 according to theembodiment of the invention may further include a lens hole reflectingsheet 126 d.

As shown in FIG. 26, the lens hole reflecting sheet 126 d may beinserted into a lens hole 235 of the reflecting sheet 126. The lens holereflecting sheet 126 d may be positioned between the lens 124 b and thelight source 203. The lens 124 b may be a refractive lens or areflective lens. The refractive or reflective lens 124 b may emit lightprovided by the light source 203 at various angles. The lens holereflecting sheet 126 d may reflect light emitted downwardly from thelens 124 b to the upward side of the lens 124 b, thereby increasinglight efficiency.

As shown in FIG. 27, the lens hole reflecting sheet 126 d may include ahole 126 bh and a ring unit 126 bb.

The hole 126 bh may be positioned in the middle of the lens holereflecting sheet 126 d. The light source 203 may be inserted into thehole 126 bh.

The ring unit 126 bb may be an outer peripheral area of the hole 126 bh.The ring unit 126 bb may include at least one lens coupling unit 126 bc.For example, at least one lens leg 124 d formed on the lower side of thelens 124 b (refer to FIG. 26) may pass through the lens coupling unit126 bc.

As shown in FIG. 28, dots DT may be formed in at least a portion of thering unit 126 bb. The dots DT may be separated from one another by avertical distance vd and/or a horizontal distance hd. The verticaldistance vd and/or the horizontal distance hd may be uniform. Forexample, the dots DT may be formed on the ring unit 126 bb at regularintervals. The vertical distance vd and/or the horizontal distance hdmay not be uniform. For example, the dots DT may be non-uniformlydistributed on the ring unit 126 bb.

FIG. 29 shows that the lens 124 b (refer to FIG. 26) and the lens holereflecting sheet 126 d (refer to FIG. 26) are not coupled. As shown inFIG. 29, one light source 203 may be configured as a plurality of LEDS.Namely, a plurality of LED chips may be used in one light package, andthus an intensity of light with respect to one light package mayincrease. The light source 203 may include first and second lightsources 203 a and 203 b.

The first and second light sources 203 a and 203 b may be positionedadjacent to each other. For example, the rectangular first and secondlight sources 203 a and 203 b may be positioned in parallel with eachother. The first and second light sources 203 a and 203 b may emit lighthaving a predetermined directivity. For example, each of the first andsecond light sources 203 a and 203 b may mainly emit light in a radialdirection HA of the outside direction.

As shown in (a) of FIG. 30, dots DT may be formed in a predeterminedarea of the lens hole reflecting sheet 126 d. The dots DT may have aconfiguration corresponding to radial characteristics of the first andsecond light sources 203 a and 203 b (refer to FIG. 29). For example,first and second dot areas DTA1 and DTA2 corresponding to the radialdirection HA(refer to FIG. 29) may be formed.

The first and second dot areas DTA1 and DTA2 may be dots positioned on apath of the radial direction HA (refer to FIG. 29). For example, thefirst and second dot areas DTA1 and DTA2 may be formed at apredetermined width. The first and second dot areas DTA1 and DTA2 may beseparated from each other. The second dot area DTA2 may be positionedfurther inside than the first dot area DTA1. A size of the first dotarea DTA1 may be greater than a size of the second dot area DTA2considering that light emitted from the first and second light sources203 a and 203 b (refer to FIG. 29) is radiated in a fan shape. Only oneof the first and second dot areas DTA1 and DTA2 may be formed, ifnecessary or desired.

As shown in (b) of FIG. 30, at least one of the first and second dotareas DTA1 and DTA2 may be formed in the reflecting sheet 126. Forexample, the first dot area DTA1 may be formed in the reflecting sheet126, and the second dot area DTA2 may be formed in the lens holereflecting sheet 126 d. The first dot area DTA1 formed in the reflectingsheet 126 may be advantageous to control a reflection amount of lightthan when the first dot area DTA1 is formed in the lens hole reflectingsheet 126 d having the relatively small area.

FIGS. 31 and 32 illustrate a reflecting sheet according to an exampleembodiment of the invention.

As shown in FIGS. 31 and 32, the reflecting sheet 126 according to theembodiment of the invention may include the dot area DA.

The dot area DA may be formed along the long side and/or the short sideof the reflecting sheet 126. Namely, the dot area DA may be formed inthe corner area of the reflecting sheet 126. In other words, the dotarea DA may be formed in the second sheet area 126 b (refer to FIG. 11)of the reflecting sheet 126 placed in the receiving unit 132 (refer toFIG. 10) of the frame 130 (refer to FIG. 10).

The dot area DA may include first and second horizontal dot areas HDA1and HDA2 and first and second vertical dot areas VDA1 and VDA2. Thefirst and second horizontal dot areas HDA1 and HDA2 are represented asthe horizontal dot area HDA, and the first and second vertical dot areasVDA1 and VDA2 are represented as the vertical dot area VDA, except inthe instance where they need to be distinguished from each other.

A shape of the horizontal dot area HDA may be different from a shape ofthe vertical dot area VDA. For example, the shape of the horizontal dotarea HDA may not be symmetric to the shape of the vertical dot area VDAbased on a cutting portion S1 positioned at the corner of the reflectingsheet 126.

The reflecting sheet 126 may include lens holes 235 for coupling thelenses 124 b (refer to FIG. 11), fixing pin holes 206, supporter holes205, a horizontal coupling unit HH, and a vertical coupling unit VH.

The lens holes 235 may be disposed in parallel with one another alongthe horizontal and vertical directions based on the size of the displaydevice 100.

The fixing pin hole 206 may be coupled to the fixing pin 202 (refer toFIG. 10) for fixing the reflecting sheet 126 to the frame 130 (refer toFIG. 10). The fixing pin hole 206 may be positioned adjacent to theoutermost lens hole 235. For example, the fixing pin hole 206 may bepositioned between the adjacent lens holes 235 or between the lens hole235 and the dot area DA.

The fixing pin hole 206 may be positioned adjacent to the lens hole 235disposed on the outermost side. For example, the fixing pin hole 206 maybe positioned closer to the outermost side than the outermost lens hole235. For example, the fixing pin hole 206 may be positioned at alocation overlapping the outermost lens hole 235.

When the fixing pin 202 (refer to FIG. 10) is coupled to the frame 130(refer to FIG. 10) through the fixing pin hole 206, the second sheetarea 126 b may be naturally formed. Namely, when the fixing pin 202(refer to FIG. 10) is coupled to the frame 130 (refer to FIG. 10)through the fixing pin hole 206 formed in the horizontal and verticaldirections, a round chamfer may be formed in the outer area of thereflecting sheet 126.

A distance between the fixing pin holes 206 may be differently set. Forexample, a number of fixing pin holes 206 positioned in a horizontalcenter area HCA may be more than a number of fixing pin holes 206positioned in other areas based on the horizontal direction of thereflecting sheet 126.

A distance between the fixing pin holes 206 positioned in the horizontalcenter area HCA may be called a first horizontal distance HD1, and adistance between the fixing pin holes 206 positioned in areas other thanthe horizontal center area HCA may be called a second horizontaldistance HD2. The first horizontal distance HD1 may be less than thesecond horizontal distance HD2. Namely, the fixing pin holes 206 in thehorizontal center area HCA may be more densely disposed. Thus, a roundchamfer may be naturally formed at the four upper, lower, left, andright corners of the reflecting sheet 126 while the reflecting sheet 126is efficiently fixed.

The fixing pin holes 206 disposed in the vertical direction may exist.For example, the fixing pin holes 206 may be disposed along the left andright short sides of the reflecting sheet 126.

The fixing pin holes 206 on the first short side SS1 may be disposed atpredetermined intervals of a first vertical distance VD1. The fixing pinholes 206 on the second short side SS2 may be disposed at predeterminedintervals of a second vertical distance VD2. The first vertical distanceVD1 and the second vertical distance VD2 may be different from eachother. The second vertical distance VD2 may be greater than the firstvertical distance VD1.

A difference between the first vertical distance VD1 and the secondvertical distance VD2 may be generated by a shape of the frame 130coupled to the reflecting sheet 126. For example, the difference betweenthe first vertical distance VD1 and the second vertical distance VD2 maybe generated by a coupling space of a rib for assisting rigidity of theframe 130 and/or various electronic parts coupled to the frame 130. Thesupporter holes 205 may be coupled to the supporters 200. The supporterholes 205 may support the diffusion plate 129 (refer to FIG. 5) and/orthe optical sheet 125 (refer to FIG. 5) on the reflecting sheet 126. Thesupporter holes 205 may be positioned in the middle of the reflectingsheet 126 for the efficient support. Namely, the supporter hole 205 maybe positioned further inside than the outermost lens hole 235.

The horizontal coupling unit HH and the vertical coupling unit VH may bedisposed along the corner area of the reflecting sheet 126. Thehorizontal coupling unit HH and the vertical coupling unit VH may beinserted into the protrusions of the frame 130 (refer to FIG. 10).

FIG. 32 shows one edge area of the reflecting sheet 126.

Outermost lens holes 235 a to 235 c may mean the lens hole 235positioned on the outermost side. Among the outermost lens holes 235 ato 235 c, the first and second outermost lens holes 235 a and 235 bpositioned on the upper side may be separated from the lower side of thehorizontal dot area HDA by a first distance HDS and may be separatedfrom the upper side of the horizontal dot area HDA by a second distanceHDE. Among the outermost lens holes 235 a to 235 c, the first and thirdlens holes 235 a and 235 c positioned on the side may be separated fromthe lower side of the vertical dot area VDA by a third distance VDS andmay be separated from the upper side of the vertical dot area VDA by afourth distance VDE.

The first distance HDS may be different from the third distance VDS, andthe second distance HDE may be different from the fourth distance VDE.This means that a width, a length, etc., of the horizontal dot area HDAmay be different from a width, a length, etc., of the vertical dot areaVDA.

The first distance HDS may be greater than the third distance VDS.Namely, a distance between the horizontal dot area HDA and the lens hole235 is greater than a distance between the vertical dot area VDA and thelens hole 235.

The second sheet area 126 b (refer to FIG. 11) corresponding to thehorizontal dot area HDA may be shorter than the second sheet area 126 b(refer to FIG. 11) corresponding to the vertical dot area VDA. Becauselengths of the long side and the short side of the second sheet area 126b are different from each other, a slope of the round chamfer of thevertical dot area VDA on the short side may be greater than a slope ofthe round chamfer of the horizontal dot area HDA on the long side. Anincrease in the slope may increase a reflectance. When the reflectanceincreases, a corresponding portion may look brighter. In the reflectingsheet 126 according to the embodiment of the invention, because thevertical dot area VDA is positioned closer to the lens hole 235 than thehorizontal dot area HDA, the reflectance may be controlled in spite ofthe high slope of the vertical dot area VDA on the short side of thereflecting sheet 126.

The non-dot area NDA may be positioned between the horizontal/verticaldot area HDA or VDA and a horizontal/vertical margin area HM or VM.Namely, the non-dot area NDA not including the dot DT may be positionedon the horizontal/vertical dot area HDA or VDA, so that the userwatching the display device 100 cannot recognize the dots DT. Thenon-dot area NDA is formed considering that the dots DT may berecognized from the outside when the dots DT exist in a correspondingarea.

The horizontal and vertical margin areas HM and VM may correspond to thethird sheet area 126 c. Namely, the horizontal and vertical margin areasHM and VM may be an outermost area of the reflecting sheet 126. In otherwords, the horizontal and vertical margin areas HM and VM may be an areaof the reflecting sheet 126 contacting the third frame area 130 c of theframe 130 (refer to FIG. 11). The dots DT may not exist in thehorizontal/vertical margin area HM or VM.

A gap CR may exist between the horizontal margin area HM and thevertical margin area VM. The reflecting sheet 126 may be a plane.Namely, the reflecting sheet 126 may be a two-dimensional plane. Whenthe reflecting sheet 126 of the two-dimensional shape is coupled to thereceiving unit 132 (refer to FIG. 10) of the three-dimensional shape,the reflecting sheet 126 may be changed into the three-dimensionalshape. The shape of the reflecting sheet 126 may be changed byoverlapping at least a portion of the reflecting sheet 126 along thecutting portion S1. A shadow may be generated by the overlap of thereflecting sheet 126. The gap CR may prevent the overlap of thereflecting sheet 126 and thus suppress the generation of the shadow.

A folded portion S2 may extend from an end of the cutting portion S1.The folded portion S2 may not be cut, unlike the cutting portion S1. Thefolded portion S2 may be formed by previously folding a correspondingarea along the cutting portion S1. Thus, when the reflecting sheet 126is changed into the three-dimensional shape in the receiving unit 132(refer to FIG. 10), the reflecting sheet 126 may be guided by the foldedportion S2 and may be changed into a previously designed shape.

FIG. 33 illustrate configuration related to a lens hole of a reflectingsheet according to an example embodiment of the invention

As shown in FIG. 33, the lens hole 235 may include first lens holes 235a and second lens holes 235 b.

As shown in (a) of FIG. 33, the first lens hole 235 a may be a lens hole235 having a ring-shapeddot area. A location of the first lens hole 235a having the ring-shapeddot area may be different from a location of thesecond lens hole 235 b not having the ring-shapeddot area. For example,the first lens holes 235 a may be positioned in the inner area of thereflecting sheet 126, and the second lens holes 235 b may be positionedin the outer area of the reflecting sheet 126. The locations of thefirst and second lens holes 235 a and 235 b may be changed.

The lens holes 235 may be arranged in the horizontal direction and/orthe vertical direction. The lens holes 235 arranged in the horizontaldirection and/or the vertical direction may be disposed in parallel withone another. Such a disposition or arrangement can achieve the commondesign and the common manufacturing process and can obtain an effectcapable of reducing the cost.

The lens holes 235 arranged in the horizontal direction and/or thevertical direction may not be disposed in parallel with one another. Forexample, the lens holes 235 may be disposed in a zigzag pattern in thevertical direction. Such a disposition or arrangement can obtain aneffect reducing a light overlap and/or a light shade between the lensholes 235.

Because the first lens hole 235 a is positioned in the inner area of thereflecting sheet 126, a luminance of the first sheet area 126 a (referto FIG. 11) of the reflecting sheet 126 may be more uniformlycontrolled. This can be clearly understood considering that lightemitted from the lens holes 235 is relatively bright around the lensholes 235 and becomes darker as it is far away from the lens holes 235.The first lens hole 235 a, in which dots are formed, may control abrightness and/or a reflectance around the lens hole 235 and mayhomogenize an entire luminance.

As shown in (b) of FIG. 33, the first lens holes 235 a may be disposedin accordance with a predetermined rule. For example, the lens holepositioned in one of the left and right directions or one of theplurality of lens holes 235 may be the first lens hole 235 a. The firstlens holes 235 a may be disposed in the zigzag pattern in the verticaldirection. Namely, the first lens holes 235 a may not be in parallelwith one another in the vertical direction. Such a disposition mayminimize a reduction in the entire brightness by the first lens hole 235a and may homogenize the luminance.

FIGS. 34 and 35 illustrate configuration related to a supporter hole ofa reflecting sheet according to an example embodiment of the invention.

As shown in FIGS. 34 and 35, the reflecting sheet 126 of the displaydevice 100 according to the embodiment of the invention may uniformlyreflect light through a dot area DTA formed around a supporter hole 205.

As shown in FIG. 34, a plurality of lens holes 235 may be formed on thereflecting sheet 126. Each of the light sources 203 coupled to theplurality of lens holes 235 may emit light.

The supporter hole 20 5 may be formed on the reflecting sheet 126. Asdescribed above, the supporter hole 205 may have a configuration for thecoupling of the supporter 200 (refer to FIG. 10).

The supporter hole 205 may be positioned further inside than the lenshole 235, which is positioned on the outermost side. For example, thesupporter hole 205 may be positioned between the lens holes 235.

The supporter hole 205 may be affected by the plurality of light sources203 coupled to the plurality of lens holes 235. For example, lightemitted from the plurality of light sources 203 may affect the specificsupporter hole 205 considering a light path LP with respect to thespecific supporter hole 205.

As described above, the supporter hole 205 maybe coupled to thesupporter 200 (refer to FIG. 10). The supporter 200 may be formed ofplastic and/or rubber material. The supporter 200 may reflect at least aportion of light. The reflecting sheet 126 according to the embodimentof the invention may have a dot area DTA in consideration of thereflection of the supporter 200, on which light can be overlappinglyconcentrated. Namely, the dot area DTA may be formed around thesupporter hole 205, so as to reduce an influence of the supporter 200 onthe reflection of the reflecting sheet 126.

As shown in FIG. 35, the dot area DTA around the supporter hole 205 maybe formed toward an inner area EA of the reflecting sheet 126. Namely,the dot area DTA may be positioned further inside than the supporterhole 205.

The plurality of dot areas DTA around the supporter holes 205 may bepositioned opposite each other. For example, when first and secondsupporter holes 205 a and 205 b exist, first and second dot areas DTA1and DTA2 may be positioned adjacent to the first and second supporterholes 205 a and 205 b further inside than the first and second supporterholes 205 a and 205 b.

The dot area DTA around the supporter hole 205 may have a semicircularshape centering around the supporter hole 205. Namely, a center area ofthe dot area DTA, which is relatively greatly affected by the supporter200 (refer to FIG. 10), may be protrudingly configured.

FIGS. 36 to 39 illustrate configuration related to a cutting portion ofa reflecting sheet according to an example embodiment of the invention.

As shown in FIGS. 36 to 39, the reflecting sheet 126 of the displaydevice 100 according to the embodiment of the invention may include acutting portion HC uniformly reflecting light.

As shown in FIG. 36, a lens hole 235 may include a first lens hole 235 aand a second lens hole 235 b.

As shown in (a) of FIG. 36, the first lens hole 235 a may be a lens hole235 including ring-shaped dots DT. A location of the first lens hole 235a including the dots DT may be different from a location of the secondlens hole 235 b not including the dot DT. For example, the first lenshole 235 a may be positioned in the inner area of the reflecting sheet126, and the second lens hole 235 b may be positioned in the outer areaof the reflecting sheet 126. The locations of the first and second lensholes 235 a and 235 b may be changed.

Because the first lens hole 235 a is positioned in the inner area of thereflecting sheet 126, an effect capable of more uniformly controlling aluminance of the first sheet area 126 a (refer to FIG. 11) of thereflecting sheet 126 may be expected. This can be clearly understoodconsidering that light emitted from the lens hole 235 is relativelybright around the lens hole 235 and becomes darker as it is far awayfrom the lens hole 235. The first lens hole 235 a, in which the dots DTare formed, may control a brightness and/or a reflectance around thelens hole 235 and may homogenize an entire luminance.

As shown in (b) of FIG. 36, the first lens holes 235 a may be disposedin accordance with a predetermined rule. For example, the lens holepositioned in one of the left and right directions or one of theplurality of lens holes 235 may be the first lens hole 235 a. The firstlens holes 235 a may be disposed in the zigzag pattern in the verticaldirection. Namely, the first lens holes 235 a may not be in parallelwith one another in the vertical direction. Such a disposition mayminimize a reduction in the entire brightness by the first lens hole 235a and may homogenize the luminance.

As shown in FIG. 37, the substrate 122 may have a shape, in which afirst substrate 122 a and a second substrate 122 b are connected.Namely, the substrate 122, on which the light source 203 is mounted inthe rear of the reflecting sheet 126, may be divided into a plurality ofsubstrates. A first light source 203 a may be positioned at the firstsubstrate 122 a, and a second light source 203 b may be positioned atthe second substrate 122 b. The first and second substrates 122 a and122 b may be connected through a connector CT.

The connector CT may be positioned between the first and secondsubstrates 122 a and 122 b. The connector CT may be a structureelectrically and/or physically connected to the first and secondsubstrates 122 a and 122 b. For example, the connector CT may be asoldering area.

The connector CT may protrude in the direction of the reflecting sheet126 by a distance CTH further than the substrate 122.

The cutting portion HC may correspond to the connector CT. For example,the cutting portion HC may be positioned on the connector CT.

As shown in FIG. 38, when the reflecting sheet 126 is coupled to thesubstrate 122, cutting surfaces HCS of the cutting portion HC may beseparated from each other. Namely, a gap may be naturally generatedbetween the cutting surfaces HCS by the connector CT, which upwardlyprotrudes. When the cutting surfaces HCS are coupled to the connectorCT, a wrinkle of the reflecting sheet 126 resulting from the connectorCT may be prevented. Thus, the non-uniformity of light resulting fromthe wrinkle of the reflecting sheet 126 may be prevented.

The dots DT may be formed in the cutting surface HCS. Namely, the dotsDT may be formed in a corresponding area, so as to control an amount oflight reflected from the cutting surface HCS, which relatively upwardlyprotrudes.

As shown in FIG. 39, the dots DT may be formed in the cutting portionHC. The dots DT may be positioned about the cutting surface HCS of thecutting portion HC. For example, the dots DT may be positioned in theleft and right cutting surfaces HCS of the cutting portion HC. Thus, thenon-uniformity of the luminance resulting from the cutting surfaces HCSmay be minimized.

The embodiments and/or the configurations of the invention may becombined with each other. For example, a configuration “A” described inone embodiment of the invention and the drawings and a configuration “B”described in another embodiment of the invention and the drawings may becombined with each other. Namely, although the combination between theconfigurations is not directly described, the combination is possibleexcept in the instance where it is described that the combination isimpossible. This is certain considering that the embodiment of theinvention relates to the display device.

Any reference in this specification to “one embodiment,” “anembodiment,” “exemplary embodiment,” etc., means that a particularfeature, structure, or characteristic described in connection with theembodiment is included in at least one embodiment of the invention. Theappearances of such phrases in various places in the specification arenot necessarily all referring to the same embodiment. Further, when aparticular feature, structure, or characteristic is described inconnection with any embodiment, it is submitted that it is within thepurview of one skilled in the art to effect such feature, structure, orcharacteristic in connection with other ones of the embodiments.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the scope of the principles of thisdisclosure. More particularly, various variations and modifications arepossible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

What is claimed is:
 1. A backlight unit comprising: a frame including abottom and a sidewall extending from the bottom; at least one substratelocated on the frame, and a plurality of light sources mounted on the atleast one substrate; and a reflecting sheet located on the at least onesubstrate, wherein the reflecting sheet comprises: a first sheet partlocated on the bottom, the first sheet part including a plurality ofholes corresponding to the plurality of the light sources; and a secondsheet part extended from the first sheet part, the second sheet partincluding a horizontal dot area located along a long side of thereflecting sheet and a vertical dot area located along a short side ofthe reflecting sheet, and at least one of the horizontal dot area andthe vertical dot area comprising first areas and second areas, whereinthe first areas are aligned with outermost holes among the plurality ofholes, and the second areas are located between the first areas, whereinthe first areas and the second areas include a plurality of dot areas,wherein the first areas are closer to the outermost holes than thesecond areas, wherein each of the dot areas includes a plurality ofdots, wherein a size of dots included in one of the plurality of dotareas is different from a size of dots included in another of theplurality of dot areas in the first area, wherein a size of dotsincluded in one of the plurality of dot areas is different from a sizeof dots included in another of the plurality of dot areas in the secondarea, wherein the first and second areas comprise inner dot areas, theinner dot areas are positioned at a same distance between a firstdistance and a second distance from a line, the line being an imaginaryline connecting the outermost holes along at least one of the long sideand the short side of the reflecting sheet, and wherein a density ofdots included in the inner dot area of the first area is greater than adensity of dots included in the inner dot area of the second area. 2.The backlight unit of claim 1, wherein the first and second areascomprise outer dot areas positioned at a same distance between thesecond distance and a third distance from the line, and wherein thedensity of dots included in the inner dot area of the first area isgreater than a density of dots included in the outer dot area of thefirst area.
 3. The backlight unit of claim 1, wherein the first andsecond areas comprise outer dot areas positioned at a same distancebetween the second distance and a third distance from the line, andwherein the density of dots included in the inner dot area of the secondarea is smaller than a density of dots included in the outer dot area ofthe second area.
 4. The backlight unit of claim 1, wherein the lineincludes a first line along the long side of the reflecting sheet and asecond line along the short side of the reflecting sheet, and wherein adistance between the first line and a closest dot to the first line onthe horizontal dot area is greater than a distance between the secondline and a closest dot to the second line on the vertical dot area. 5.The backlight unit of claim 1, wherein dot patterns of the horizontaldot area are different from dot patterns of the vertical dot area. 6.The backlight unit of claim 1, wherein an area of the horizontal dotarea is different from an area of the vertical dot area.
 7. Thebacklight unit of claim 1, wherein, in a corner of the reflecting sheet,a shape of the horizontal dot area is asymmetric with a shape of thevertical dot area.
 8. The backlight unit of claim 1, wherein the lineincludes a first line along the long side of the reflecting sheet and asecond line along the short side of the reflecting sheet, and wherein adistance between the first line and a farmost dot in a verticaldirection from the first line on the horizontal dot area is differentfrom a distance between the second line and a farmost dot in ahorizontal direction from the second line on the vertical dot area. 9.The backlight unit of claim 1, wherein the reflecting sheet furthercomprises a third sheet part extending from the second sheet part andbeing located on the sidewall.
 10. The backlight unit of claim 9,wherein, in the second sheet part, the density of dots of the firstareas and the second areas increases as the dots approach the thirdsheet part.
 11. The backlight unit of claim 9, wherein the first areasfurther include a third dot area, wherein the third dot area is closerto the third sheet part rather than the inner dot area, and wherein adensity of dots included in the third dot area is smaller than thedensity of dots included in the inner dot area.
 12. The backlight unitof claim 11, wherein the density of dots included in the outer dot areais smaller than the density of dots included in the inner dot area. 13.The backlight unit of claim 9, wherein the third sheet part comprises along third sheet part along the long side of the reflecting sheet and ashort third sheet part along the short side of the reflecting sheet,wherein the line includes a first line along the long side of thereflecting sheet and a second line along the short side of thereflecting sheet, and wherein a distance between the first line and thelong third sheet part is different from a distance between the secondline and the short third sheet part.
 14. The backlight unit of claim 1,wherein the second sheet part is bent from the first sheet part.
 15. Thebacklight unit of claim 1, wherein the first area and the second areaare sequentially positioned.
 16. A display'device comprising: a displaypanel; a backlight unit at a rear of the display panel; and a back coverat a rear of the backlight unit, wherein the backlight unit comprises: aframe including a bottom and a sidewall extending from the bottom; atleast one substrate located on the frame, and a plurality of lightsources mounted on the at least one substrate; and a reflecting sheetlocated on the at least one substrate, wherein the reflecting sheetcomprises: a first sheet part located on the bottom, the first sheetpart including a plurality of holes corresponding to the plurality ofthe light sources; and a second sheet part extended from the first sheetpart, the second sheet part including a horizontal dot area locatedalong a long side of the reflecting sheet and a vertical dot arealocated along a short side of the reflecting sheet, and at least one ofthe horizontal dot area and the vertical dot area comprising first areasand second areas, wherein the first areas are aligned with outermostholes among the plurality of holes, and the second areas are locatedbetween the first areas, wherein the first areas and the second areasinclude a plurality of dot areas, wherein the first areas are closer tothe outermost holes than the second areas, wherein each of the dot areasincludes a plurality of dots, wherein a size of dots included in one ofthe plurality of dot areas is different from a size of dots included inanother of the plurality of dot areas in the first area, wherein a sizeof dots included in one of the plurality of dot areas is different froma size of dots included in another of the plurality of dot areas in thesecond area, wherein the first and second areas comprise inner dotareas, the inner dot areas are positioned at a same distance between afirst distance and a second distance from a line, the line being animaginary line connecting the outermost holes along at least one of thelong side and the short side of the reflecting sheet, and wherein adensity of dots included in the inner dot area of the first area isgreater than a density of dots included in the inner dot area of thesecond area.
 17. The display device of claim 16, wherein the first andsecond areas comprise outer dot areas positioned at a same distancebetween the second distance and a third distance from the line, andwherein a density of dots included in the inner dot area of the firstarea is greater than a density of dots included in the outer dot area ofthe first area.
 18. The display device of claim 16, wherein the firstand second areas comprise outer dot areas positioned at a same distancebetween the second distance and a third distance from the line, andwherein a density of dots included in the inner dot area of the secondarea is smaller than a density of dots included in the outer dot area ofthe second area.
 19. The display device of claim 16, wherein the lineincludes a first line along the long side of the reflecting sheet and asecond line along the short side of the reflecting sheet, and wherein adistance between the first line and a closest dot to the first line onthe horizontal dot area is greater than a distance between the secondline and a closest dot to the second line on the vertical dot area. 20.The display device of claim 16, wherein dot patterns of the horizontaldot area are different from dot patterns of the vertical dot area. 21.The display device of claim 16, wherein an area of the horizontal dotarea is different from an area of the vertical dot area.
 22. The displaydevice of claim 16, wherein, in a corner of the reflecting sheet, ashape of the horizontal dot area is asymmetric with a shape of thevertical dot area.
 23. The display device of claim 16, wherein the lineincludes a first line along the long side of the reflecting sheet and asecond line along the short side of the reflecting sheet, and wherein adistance between the first line and a farmost dot in a verticaldirection from the first line on the horizontal dot area is differentfrom a distance between the second line and a farmost dot in ahorizontal direction from the second line on the vertical dot area. 24.The display device of claim 16, wherein the reflecting sheet furthercomprises a third sheet part extending from the second sheet part andbeing located on the sidewall.
 25. The display device of claim 24,wherein, in the second sheet part, the density of dots of the firstareas and the second areas increases as the dots approach the thirdsheet part.
 26. The display device of claim 24, wherein the first areasfurther include a third dot area, wherein the third dot area is closerto the third sheet part rather than the inner dot area, and wherein adensity of dots included in the third dot area is smaller than thedensity of dots included in the inner dot area.
 27. The display deviceof claim 26, wherein the density of dots included in the outer dot areais smaller than the density of dots included in the inner dot area. 28.The display device of claim 24, wherein the third sheet part comprises along third sheet part along the long side of the reflecting sheet and ashort third sheet part along the short side of the reflecting sheet,wherein the line includes a first line along the long side of thereflecting sheet and a second line along the short side of thereflecting sheet, and wherein a distance between the first line and thelong third sheet part is different from a distance between the secondline and the short third sheet part.
 29. The display device of claim 16,wherein the second sheet part is bent from the first sheet part.
 30. Thedisplay device of claim 16, wherein the first area and the second areaare sequentially positioned.